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A Calorie Deficit cannot EVER exist – here’s why!

2025-09-09 Education
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Jason Fung
Jason Fung
1.4m subscribers

Why the Calorie Deficit Myth Fails: Focus on Insulin for Lasting Weight Loss

Stop tracking calories; they fail because they ignore the control mechanism governing body fat release. Learn why focusing solely on insulin unlocks healthy, sustainable fat loss.

Short Summary

  • Restrictive dieting often fails because high insulin levels actively block the body from accessing stored energy.
  • True fat loss requires low insulin states, achieved through strategies like intermittent fasting, enabling fat mobilization.
  • Food quality matters because it dictates the immediate hormonal instruction (store vs. burn) for the calories consumed.

This discussion debunks the universal application of the energy balance equation. It clearly demonstrates that regardless of calorie count, high insulin prevents fat mobilization, making hormone management the true key to successful weight management.

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Description

Most people are told that “weight loss = calorie deficit.” But the truth is, a calorie deficit is a myth. Your body is not a simple calculator where you just subtract calories and lose fat. In this video, Dr. Jason Fung explains the science behind why focusing only on calories fails, and why hormones, insulin, and fat metabolism are the real keys to healthy and lasting weight loss. When people try extreme dieting or drug-induced appetite suppression, they often experience side effects like the dreaded “Ozempic face” — hollow cheeks, sagging skin, and an unhealthy look. This happens because subcutaneous fat (the fat under the skin) gets burned instead of visceral fat (the dangerous fat around your organs). The result: you may lose weight, but you don’t look or feel healthy. Fasting works completely differently. Instead of just cutting calories, fasting changes your hormones and metabolism: �� Insulin drops, allowing fat burning to start �� Growth hormone rises, protecting muscle and skin elasticity �� Autophagy activates, repairing tissues and preventing loose skin �� Visceral fat is targeted, which improves health and appearance �� Brown fat (through beiging) is activated, boosting metabolism naturally That’s why people who fast look healthier, stronger, and younger compared to those who follow harsh calorie-restricted diets. In this video you’ll discover: ✅ Why calorie restriction almost always fails ✅ The science of subcutaneous vs. visceral fat ✅ How fasting avoids the “Ozempic face” problem ✅ The role of hormones in fat burning and aging ✅ How fasting improves skin health, prevents sagging, and supports long-term fat loss �� If you’re serious about losing weight without losing your health or youthfu look, this video is a must-watch. �� Subscribe now for more science-backed videos on fasting, weight loss, an metabolic health. And don’t forget to like ��, comment ��, and share this vid with anyone who still believes in the calorie deficit myth! ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ ⏱️ Chapters / Timestamps 0:00 – Introduction: Why “calorie deficit” is a myth 1:10 – The calorie counting problem explained 2:30 – How calorie restriction affects your body 3:45 – Subcutaneous vs. visceral fat: which one really matters? 5:20 – Why fasting is different from dieting 6:40 – Hormonal impact: insulin, growth hormone & fat burning 8:00 – Fasting and skin health (no sagging, no hollow cheeks) 9:25 – Autophagy and natural skin tightening 10:45 – White fat vs. brown fat (the beiging effect) 11:50 – Key takeaway: Why calorie deficit cannot ever exist ============================= �� BOOKS: �� The Obesity Code - Reviewing underlying physiology of weight loss an how low carb diets and fasting can help. https://www.amazon.com/dp/1771641258?... �� The Diabetes Code - Reviewing how type 2 diabetes is a reversibl disease and dietary strategies. https://www.amazon.com/dp/B0795BLS8D?... �� The Cancer Code - Scientific exploration of how cancer develops https://www.amazon.com/dp/0062894005?... �� Amazon: �� USA - https://www.amazon.com/shop/jasonfung �� Canada - https://www.amazon.ca/shop/jasonfung ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ �� Please visit our :- �� Website - https://www.doctorjasonfung.com �� Blog- / drjasonfung �� Community- https://www.thefastingmethod.com �� Facebook - / jason.fung.313 �� Instagram - / drjasonfung �� Twitter - / drjasonfung ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ �� YouTube Medical Lectures (for specialist physicians) ▶️ The Roots of the Obesity Epidemic: https: // • The Obesity Epidemic, Explained ▶️ Therapeutic Fasting - The Two Compartment Problem:https: // • Fasting and Weight Loss - Solving the... ▶️ Does Calorie Counting work?: • Why Calorie Counting rarely leads to ... ▶️ Two Big Lies of Type 2 Diabetes: • Two Big Lies about Type 2 Diabetes ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ If you liked the video, Please Do Subscribe My Channel ���� Keep Supporting me So I can Continue to provide you with free content each week!!�� ▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬▬ �� �� Thank you for Watching #Fasting #FastingMimickingDiet #DrJasonFung #WeightLoss #IntermittentFasting #FastingForWomen

Top Comments (10)

@chazjackson-ahealthfitness2611 2025-09-09

I have lost over 300 pounds following Dr. Fung's among others advice. You help saved at least 3 people in my family.

315 10 replies
@mikep4957 2025-09-09

I lost 50 pounds this year, 250 to 200, after reading your book. Thank you!!!!

247 9 replies
@A-man-yf6pr 2025-09-09

As the proud owner of The Obesity Code and my favorite The Complete Guide To Fasting, I just want to say thank you Dr Fung for your dedication to our health.

131 1 replies
@DaniGirl6 2025-09-09

I went from 230 to 140. Then went back to 240 over 2 year of depression and grief over loss of loved ones and long job insecurity that resulted in a layoff of my whole department. Now 223 and try to lose weight again. The emotional connection to food is a significant factor for me apparently.

62 27 replies
@beasley13 2025-09-12

I see on YouTube all these videos saying calories don't matter which didn't make sense to me. This video puts the importance of calories into a much more enlightened perspective. Thank you.

51
@fatherofunicorns700 2025-09-18

I was diagnosed with diabetes in 2011 and pretty much ignored it. 2021 a new doctor put me on Ozempic and other insulins to treat my diabetes. I found Dr Fung and watched his videos and read "The Diabetes Code". In 3 months I lost 30 pounds and 4 inches off my waistline. Easting one meal a day and weekend fasting. Feeling better, glucose levels under control. Meeting with doctor to reevaluate my medications. Thank you Dr. Fung.

35 2 replies
@MrNimbacounty 2025-09-10

Dr. Jason Fung for the Nobel Prize. I agreed from Liberia 100%.

35
@dinapawlow1622 2025-09-09

Following your advice I lost30 lbs 7 years ago and it is still gone! Thank you ❤

21
@dusaneayurved 2025-09-14

The foods does not only carries calories but it carries inormation! Very well said!

13
@AndiGe_ 2025-11-07

From 12.1% at diagnosis to 6.1% within 3 months with the information found in your books and on your channel. Just received the results of my 2nd checkup. Your are a life safer!

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